SAE-AISI M42 Steel vs. ASTM B780 Alloy
SAE-AISI M42 steel belongs to the iron alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 13 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is ASTM B780 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 83 |
| Poisson's Ratio | 0.29 | |
| 0.36 |
| Shear Modulus, GPa | 78 | |
| 30 |
| Tensile Strength: Ultimate (UTS), MPa | 810 to 2310 | |
| 330 to 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 140 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 270 |
| Thermal Expansion, µm/m-K | 12 | |
| 18 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.2 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 4.5 |
| Stiffness to Weight: Bending, points | 24 | |
| 14 |
| Strength to Weight: Axial, points | 28 to 79 | |
| 9.1 to 16 |
| Strength to Weight: Bending, points | 24 to 48 | |
| 11 to 15 |
| Thermal Shock Resistance, points | 25 to 71 | |
| 16 to 29 |
Alloy Composition
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 1.1 to 1.2 | |
| 0 |
| Chromium (Cr), % | 3.5 to 4.3 | |
| 0 |
| Cobalt (Co), % | 7.8 to 8.8 | |
| 0 |
| Copper (Cu), % | 0 to 0.25 | |
| 23.5 to 25.7 |
| Iron (Fe), % | 76.3 to 81 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Manganese (Mn), % | 0.15 to 0.4 | |
| 0 |
| Molybdenum (Mo), % | 9.0 to 10 | |
| 0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0.35 to 0.65 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.65 | |
| 0 |
| Silver (Ag), % | 0 | |
| 74 to 76 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tungsten (W), % | 1.2 to 1.9 | |
| 0 |
| Vanadium (V), % | 1.0 to 1.4 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |